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The mole fraction of the solute in one molal aqueous solution is :

  1. A
    0.054
  2. B
    0.042
  3. C
    0.018
  4. D
    0.009

Solution & Step-by-step Explanation

A one molal solution means there is one mole of solute per kilogram of solvent. To find the mole fraction of the solute, we need to know the number of moles of solvent (water) in one kilogram. The molecular weight of water is approximately 18 g/mol, so in 1 kg (1000 g) of water, there are 1000/18 = 55.56 moles of water. If we have 1 mole of solute, the total number of moles in the solution is 1 (solute) + 55.56 (water) = 56.56 moles. The mole fraction of the solute is then 1 / 56.56. Calculating this gives us the mole fraction of the solute.

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The mole fraction of the solute in one molal aqueous solution is :
A
0.054
B
0.042
C
0.018
D
0.009

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Mole Fraction

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